Nonfreezing blow-off valve



1, 1924. 1 1,515,720 A. BLONDEAU NONFREEZING Bmw-0F11 VALVE Filed Nov. 22 1923 A inventor www Mar fandaz@ 'I n @n l I Ly/ l By Attorney Patented Nov. I8, 192.4.

airain erariale ALEXANDER BLONDEAU, 0F ESTEVAN, SASKATIIEIAN, CANA'BA.

NONFREEZING BLOVLOFF VALVE.

Application filed November 22, 1923. Serial No. 676,392.

To all whom t may concern.'

Be it known that I, ALEXANDER ELoN- DEAU, a subject of the King of Great Britain, residing at Estevan, Province oit Saslratchewan, Canada, have invented certain new and useful Improvements in Nontreezing Blow-Ofi Valves; and I do hereby declare that the following is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to a novel blow-olil valve adapted for use in connection with railway or stationary boilers.

The principal object of this invention is a device of this character which is not susceptible to freezing and consequent clogging in cold weather. vFor this purpose, there is provided a valve body or casing having a valve seat formed thereon which is adapted to be disposed in a warm region of the boiler. The valve head operating means passes through the valve casing in such a manner as to prevent the leakage ot water throughv the juncture whereby freezing of the working parts is avoided.

The invention further includes novel clamping means with which the valve body is maintained in proper position against the weight of the external yworking parts and the pull exerted thereon.

The invention is fully disclosed in the following description and in the acco1npanying drawings in which: I

Figure 1 is a vertical section through the device as applied to a locomotive boiler;

Figure 2 is a similar view showing .the valve :in open position;

Figure 3 is a section on the line 33 oit Figure 1;

Figure f1 is a section on the line 4-4 of Figure 2;

Figure 5 is a section on the line 5-5 oit' Figure 2;

Figure 6 is a side elevation of the device, slightly modified, applied to a return tube boiler;

Figure 7 is a longitudinal vertical section of the modification shown in Figure 6; and

Figure 8 is an outer end view.

Reference will now be had to these'views by means of like characters which are employed to designate corresponding parts throughout.

In Figure 1 is shown the bottom water leg 1 of a boiler formed by a furnace plate 2 and shell 3 spaced by a bolt e, and riveted together at the lower ends as at 5. An opening 6 is formed through the shell and receives the inner threaded end of a substantially tubular valve casing or body 7.

The outer end of the casing is also thread ed as at 7 for the reception of an internally threaded nipple 8. A t the outer end of the nipple is formed a plurality7 of spaced ears 8 between which are received similar spaced ears 9 of a lid 10. One of the ears of the lid is extended as at 9 to form a stop adapt ed to limit the upward movement ci? the lid, as illustrated'in Figure 2. The lid is normally retained in closed position by gravity, as is apparent fromFigure 1.

A. valve seat 1l is formed at the inner end of the casing which is disposed within the water leg and is adapted to be closed by a cap or head 12 on which is formed a plural ity of spaced prongs 13 slidably received within the valve casing.V 0n the outer wall ot the casing is formed an enlargement 141 inthe upper portion of which is cut a spherical cavity 15. This cavity communicates with the interior of the valve casing 7 through an aperture 15. Within the cavity or socket is rotatably supporteda bearing member 16 held in place by a cap 17 secured to the enlargement by means of bolts 17. One leg of a bell crank lever 18 passes through the bearing to the interior of the valve body. .A lug 19 at the inner iace of the valve head is joined to'the inner end o'lf the bell crank lever by means ot a stein or link 20. The outer cud ot the bell crank lever has connected thereto an operating link 21 by means ot which the valve may be ac tuated from a distant point. 'Ilie outer leg of the bell crank lever and the inner end of the link 21 are slotted as at 21a. rIhe two parts are held together by means of bolts 21b whereby the member 21 may be eXtended as far as desired within the limits of the slots.

In the above views the bell crank lever is shown as lying in a vertical plane. How ever, it may be desirable in some cases to turn the valve body so that the bell crank lever takes another position. In such a case, the nipple 8 may be maintained in the position indicated, because of its threaded connection to the valve body, so that the lid will always close by gravity, as above mentioned. i

In order to maintain the valve body in the desired position against the weight of the parts 16, 17, and 18 and against the pull exerted on the link 21, there is provided at the outer surface et tie valve body a here agonal collar 22 which is engaged on its inner tace by a pla Ae 2?, rhe latter carries a pair ol? ears 24 through which are passed bolts 25 bearing against the shell 3. The bolts are turned until the plate 23 presses iirmly against the collar 22 and are then locked in place by means ot nuts Q5', the valve body being braced in this manner.

lNhenit is desir d to actuate the valve, it is only necessary to turn the bell crank lever whereby the bearing is rotated in its socket and the valve head moves inwardly, allowing the water to enter the spaces between the prongs 13. rlhe pressure oit the water is suiiicient to raise the lid 10, as shown in Figure 2, to allow discharge. lt is noted that in all positions et the valve, the bearing 15 is so disposed in its socket as to prevrvent leakage through the opening 15.

In Figures 6 and 7, the device is shown applied to a stationary or return boiler 26. The valve body 7 is connected to the water discharge pipe 27 by means of a union 28. The threaded outer end of the valve body receives a nipple 29 to which is connected a take-oft f conduit SO. The latter is also threaded at its outer end as at 31 to receive the lid carrying nipple 32. As is apparentfrom Figure 7, the pipe 27 passes through the wall 38, while the take-oil conduit 30 is supported in an exterior wall 311.

While a specific embodiment of the invention has been illustrated and described, it is to be understood that various alterations in the details of construction may be made without departing from the spirit of the invention asV indicated by the appended claims.

Having thus :tully described the invention, what l claim as new and desire to protect by Letters Patent is 1. A valve comprising a cylindrical casing` a seat formed at one end thereof, a valve head adapted to cooperate with said seat, a lever pivoted in the wall of said casing and extending to the interior ot the latter, and a link connecting said lever to the valve head.

Q. A valve comprising a cylindrical casing, a seat formed at one end thereo'l, a

'valve head adapted to cooperate with said v seat, said valve head having a plurality ot prongs slidablj.v received within the valve casing. a lever pivoted in the Wall of the casi 0' and extending to the interior ot the latterv` and a link connecting said lever with the valve head.

3. A valve comprising a cylindrical easing having` a spherical recess cut in the wall tl erect, a bearing rotatably mounted in said recess, a lever extending inwardly trom said bearing to the interior of the easing, a valve seat formed at one end ot said casing, a valve head adapted to cooperate with said seat, and a link connecting said lever and valve head.

4. A valve comprising a cylindrical casing having a spherical recess cut in the wall thereof, a bearing rotatably mounted in said recess, a lever extending .inwardly trom said bearing to the interior ot the casing, a valve seat formed at one end of said casing, a valve head adapted to cooperate with said seat, said head having a plurality of spaced prongs slidably received within the easing, and a link connecting said lever and head.

5. A valve comprising a. cylindrical casing, a seat formed at one end thereof, a valve head adapted to cooperate with said seat, a lever pivoted in the wall of said casing and extending to the interior of the lat ter, a link connecting said lever to the valve head, and a lid hinged to the opposite end ot said casing.

In witness whereolE l have hereunto set my hand.

ALEXANDER BLONDEAU. 

